The LCD #118 was originally a variation of my LCD #117 LCD driver chip. It operated at 2400 baud and was intended for operation with the PICAXE family of processors. The LCD #118 used an external 4.0 MHz resonator which is not used in the LCD #117 design and thus the two designs are not physically interchangeable. That is, an LCD #117-2400 cannot be plugged into an application which used an LCD #118.